Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 538, NWS Norman, OK

July 1, 2015Grant County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 1, 2015, 8:07 PM CDT for Grant County, Oklahoma. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 1, 2015, 8:07 PM CDT (01:07 UTC)
Expired: Jul 1, 2015, 8:45 PM CDT
In force: 38 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Grant County, OK

The radar

The Vance AFB radar (KVNX), 31 km from the middle of the area, began a volume at 01:07 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Topeka, KS (KFOE), launched 00:00Z, 1.1 hours before the alert went out and 309 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 844 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1888 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 1, 6:31 PM CDT, 1 hour 36 minutes earlier.

Area forecast discussion, Jul 1, 6:31 PM CDT, 1 hour 36 minutes before

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Hazardous weather outlook, Jul 1, 11:50 AM CDT, 8 hours 17 minutes before

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In the hours before

Special weather statement, Jul 1, 6:41 PM CDT, 1 hour 26 minutes before

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Special weather statement, Jul 1, 7:15 PM CDT, 52 minutes before

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The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 1, 7:15 PM CDT	Special Weather Statement	OUN	Alfalfa, Grant	45 min
Jul 1, 8:40 PM CDT	Special Weather Statement	OUN	Kay	35 min
Jul 1, 8:45 PM CDT	Special Weather Statement	OUN	Grant	30 min
Jul 2, 3:33 PM CDT	Special Weather Statement	OUN	Garfield, Noble	27 min
Jul 2, 3:59 PM CDT	Special Weather Statement	OUN	Noble	31 min
Jul 2, 4:06 PM CDT	Special Weather Statement	OUN	Caddo	24 min
Jul 2, 4:31 PM CDT	Special Weather Statement	OUN	Payne	29 min
Jul 2, 4:42 PM CDT	Severe Thunderstorm Warning	OUN	Payne	33 min
Jul 2, 4:56 PM CDT	Special Weather Statement	OUN	Harper	34 min
Jul 2, 5:11 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	33 min
Jul 2, 5:13 PM CDT	Severe Thunderstorm Warning	OUN	Harper	36 min
Jul 2, 5:24 PM CDT	Severe Thunderstorm Warning	OUN	Major	51 min
Jul 2, 5:30 PM CDT	Special Weather Statement	OUN	Woodward	30 min
Jul 2, 5:57 PM CDT	Special Weather Statement	OUN	Oklahoma	33 min
Jul 2, 6:09 PM CDT	Special Weather Statement	OUN	Ellis	36 min
Jul 2, 6:11 PM CDT	Special Weather Statement	OUN	Major	34 min
Jul 2, 6:21 PM CDT	Special Weather Statement	OUN	Noble	24 min
Jul 2, 6:36 PM CDT	Areal Flood Advisory	OUN	Lincoln, Oklahoma	3 hr
Jul 2, 6:39 PM CDT	Special Weather Statement	OUN	Lincoln	21 min
Jul 2, 6:56 PM CDT	Special Weather Statement	OUN	Major	34 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2015 Every severe thunderstorm warning in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.